i was thinking something wrong with the wiring in the steering wheel. but the steering wheel controls will only jog through your presets. the changing in the stations are from a preset of 101.1 to a random 101.3 or somethin like that. so i'm thinking it's the HU itself.
as for the sunroof, yeah that's the issue that's getting all these people that nice lil tC model. it only pertains to a few '06 models, i believe it was mori that posted somewhere here which VINs are affected. (which i just searched for and came up with nothing, did i dream this???)
just re-read it and saw that you said some dealers weren't sending out the letters?? gonna have to look into this, maybe i can score me a free jada tC model too!